Make improvements

- You can now run `make -j8 toolchain` on Windows
- You can now run `make -j` on MacOS ARM64 and BSD OSes
- You can now use our Emacs dev environment on MacOS/Windows
- Fix bug where the x16 register was being corrupted by --ftrace
- The programs under build/bootstrap/ are updated as fat binaries
- The Makefile now explains how to download cosmocc-0.0.12 toolchain
- The build scripts under bin/ now support "cosmo" branded toolchains
- stat() now goes faster on Windows (shaves 100ms off `make` latency)
- Code cleanup and added review on the Windows signal checking code
- posix_spawnattr_setrlimit() now works around MacOS ARM64 bugs
- Landlock Make now favors posix_spawn() on non-Linux/OpenBSD
- posix_spawn() now has better --strace logging on Windows
- fstatat() can now avoid EACCES in more cases on Windows
- fchmod() can now change the readonly bit on Windows

libc/calls/createfileflags.c

@@ -18,6 +18,7 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/assert.h"
 #include "libc/calls/calls.h"
+#include "libc/calls/createfileflags.internal.h"
 #include "libc/nt/createfile.h"
 #include "libc/nt/enum/accessmask.h"
 #include "libc/nt/enum/creationdisposition.h"
@@ -26,23 +27,6 @@
 #include "libc/sysv/consts/o.h"
 #include "libc/sysv/errfuns.h"
 
-// code size optimization
-// <sync libc/sysv/consts.sh>
-#define _O_APPEND     0x00000400  // kNtFileAppendData
-#define _O_CREAT      0x00000040  // kNtOpenAlways
-#define _O_EXCL       0x00000080  // kNtCreateNew
-#define _O_TRUNC      0x00000200  // kNtCreateAlways
-#define _O_DIRECTORY  0x00010000  // kNtFileFlagBackupSemantics
-#define _O_UNLINK     0x04000100  // kNtFileAttributeTemporary|DeleteOnClose
-#define _O_DIRECT     0x00004000  // kNtFileFlagNoBuffering
-#define _O_NONBLOCK   0x00000800  // kNtFileFlagWriteThrough (not sent to win32)
-#define _O_RANDOM     0x80000000  // kNtFileFlagRandomAccess
-#define _O_SEQUENTIAL 0x40000000  // kNtFileFlagSequentialScan
-#define _O_COMPRESSED 0x20000000  // kNtFileAttributeCompressed
-#define _O_INDEXED    0x10000000  // !kNtFileAttributeNotContentIndexed
-#define _O_CLOEXEC    0x00080000
-// </sync libc/sysv/consts.sh>
-
 textwindows int GetNtOpenFlags(int flags, int mode, uint32_t *out_perm,
                                uint32_t *out_share, uint32_t *out_disp,
                                uint32_t *out_attr) {